C21B 13/04
In retorts
Official title: in retorts
C21B13/04 (In retorts) appears on 28 US grants and 5 published applications in this corpus.
Search patents in C21B- Granted patents
- 28
- Published applications
- 5
- Assignees
- 16
- Inventors
- 41
- Latest grant
- 3 Jun 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 3 | 0 |
| 1978 | 3 | 0 |
| 1979 | 1 | 0 |
| 1980 | 5 | 0 |
| 1981 | 4 | 0 |
| 1982 | 2 | 0 |
| 1983 | 2 | 0 |
| 1984 | 0 | 0 |
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 1 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 1 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 1 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 1 |
| 2007 | 0 | 1 |
| 2008 | 0 | 0 |
| 2009 | 1 | 0 |
| 2010 | 1 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 0 |
| 2013 | 0 | 0 |
| 2014 | 0 | 0 |
| 2015 | 0 | 0 |
| 2016 | 0 | 0 |
| 2017 | 0 | 0 |
| 2018 | 0 | 0 |
| 2019 | 0 | 1 |
| 2020 | 0 | 0 |
| 2021 | 0 | 0 |
| 2022 | 0 | 0 |
| 2023 | 0 | 2 |
| 2024 | 0 | 0 |
| 2025 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Modular direct reduction systems and associated methods3 Jun 2025US 12,319,975 B2Fluor Technologies Corporation
- Process and apparatus for extracting zinc7 Sep 2010US 7,790,099 B2David Wilson Investments Pty. Ltd.
- Production of iron using environmentally-benign renewable or recycled reducing agents15 Dec 2009US 7,632,330 B2Michigan Technological University
- Method and apparatus removing undesirable metals from iron-containing materials30 Apr 2002US 6,379,421 B1Hylsa S.A. de C.V.
- Process for the production of iron carbide7 Feb 1995US 5,387,274 AC.V.G. Siderurgica Del Orinoco, C.A.
- Low temperature direct reduction of metal oxides via the in situ production of reducing gas9 Nov 2023US 2023/0357884 A1Environmental Clean Technologies Limited
- Modular direct reduction systems and associated methods21 Sep 2023US 2023/0295755 A1Fluor Technologies Corporation
- Low temperature direct reduction of metal oxides via the in situ production of reducing gas3 Oct 2019US 2019/0300982 A1Environmental Clean Technologies Limited
- Production of iron using environmentally-benign renewable or recycled reducing agents13 Sep 2007US 2007/0209480 A1Michigan Technological University
- Process and apparatus for extracting zinc15 Jun 2006US 2006/0123952 A1The Australian Steel Company (Operations) Pty Ltd
Most cited
By later US patents
- Fluid-wall reactor for high temperature chemical reaction processes62US 4,199,545 AThagard Technology Company · 1980
- High temperature chemical reaction processes utilizing fluid-wall reactors34US 4,056,602 AThagard Technology Company · 1977
- Process for the production of iron carbide22US 5,387,274 AC.V.G. Siderurgica Del Orinoco, C.A. · 1995
- High temperature chemical reaction processes utilizing fluid-wall reactors21US 4,095,974 AThagard Technology Company · 1978
- Method and apparatus for the direct reduction of iron11US 5,064,467 AC.V.G. Siderurgica Del Orinoco, C.A. · 1991